During the Galactus saga, the Fantastic Four are in Russia, fighting against the Silver Surfer. Richards checks his computers, and orders Sue to make the strongest forcefield she could make. She can not, she's too weak after fighting with the Surfer. Without saying or doing anything else, he took her and hug her, and declared than no matter if Earth survives or not, he would carry his love for her for all eternity. And then, the atomic bombs destroy Moscow. The Silver Surfer survives the explosion (because an herald of Galactus is THAT though), but he found the scene so heartwarming that he began to consider that humanity might be worth being spared from Galactus' hunger.